Since I spoke to a couple of people about this at Intercon-

Endgame  is actively looking for NPCs. We're scheduled for the following dates in 2007:

          - May 4-6 

          -June 8-10

          -September 14-16

          -October 12-14

If you're interested in NPCing, trying out a boffer larp(*), getting XP for other nTeraction games, come and NPC for us!! Drop a line and let us know you plan to attend, as we're already starting to pre-cast a few roles for the 1st event. We'd love to have you!

(Wow. Lots of posting today. Normally I don't post nearly this much)

Edit:  I should mention our yahoo group for NPCs-
http://games.groups.yahoo.com/group/EndgameNPCs/

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(*) We use foam boffer weapons, some Nerf guns, and do have these available for NPCs at Monster Camp for use during the weekend, if you don't have your own.  If you have questions on this or other items, just email or post and ask.